diff --git a/web/src/components/sections/InsideGlobe/BuildFilters.module.css b/web/src/components/sections/InsideGlobe/BuildFilters.module.css
new file mode 100644
index 00000000..26ae5ca9
--- /dev/null
+++ b/web/src/components/sections/InsideGlobe/BuildFilters.module.css
@@ -0,0 +1,49 @@
+.filters {
+  position: absolute;
+  top: 4px;
+  left: 50%;
+  transform: translateX(-50%);
+  z-index: 4;
+  display: flex;
+  gap: 2px;
+  padding: 2px;
+  background: var(--pf-cream);
+}
+
+.filters button {
+  appearance: none;
+  border: 0;
+  background: transparent;
+  color: var(--pf-ink-muted);
+  padding: 6px 12px;
+  font-family: var(--pf-mono);
+  font-size: 11px;
+  line-height: 16px;
+  white-space: nowrap;
+  cursor: pointer;
+}
+
+.filters button:hover {
+  color: var(--pf-ink);
+}
+
+.filters button[aria-pressed='true'] {
+  background: var(--pf-ink);
+  color: var(--pf-cream);
+}
+
+.filters button:focus-visible {
+  outline: 2px solid var(--pf-led);
+  outline-offset: 2px;
+}
+
+@media (max-width: 900px) {
+  .filters {
+    top: auto;
+    bottom: 8px;
+  }
+  .filters button {
+    min-height: 44px;
+    padding: 8px 12px;
+  }
+}
diff --git a/web/src/components/sections/InsideGlobe/BuildFilters.tsx b/web/src/components/sections/InsideGlobe/BuildFilters.tsx
new file mode 100644
index 00000000..8c11e6d8
--- /dev/null
+++ b/web/src/components/sections/InsideGlobe/BuildFilters.tsx
@@ -0,0 +1,23 @@
+'use client';
+
+import { BUILD_FILTERS } from './builds';
+import { useBuildSelection } from './useBuildSelection';
+import styles from './BuildFilters.module.css';
+
+export default function BuildFilters() {
+  const { filter, setFilter } = useBuildSelection();
+  return (
+    <div className={styles.filters} role="group" aria-label="Filter map and list">
+      {BUILD_FILTERS.map(({ value, label }) => (
+        <button
+          key={value}
+          type="button"
+          aria-pressed={filter === value}
+          onClick={() => setFilter(value)}
+        >
+          {label}
+        </button>
+      ))}
+    </div>
+  );
+}
diff --git a/web/src/components/sections/InsideGlobe/BuildIndex.test.tsx b/web/src/components/sections/InsideGlobe/BuildIndex.test.tsx
new file mode 100644
index 00000000..958366bf
--- /dev/null
+++ b/web/src/components/sections/InsideGlobe/BuildIndex.test.tsx
@@ -0,0 +1,64 @@
+import { beforeEach, describe, expect, it } from 'vitest';
+import { act, fireEvent, render, screen, within } from '@testing-library/react';
+import { useAppStore } from '@/store/useAppStore';
+import BuildFilters from './BuildFilters';
+import BuildIndex from './BuildIndex';
+import BuildRouteSync from './BuildRouteSync';
+import { builds } from './builds';
+
+beforeEach(() => {
+  useAppStore.setState({ selectedBuildId: null, insideFilter: 'all' });
+  window.history.replaceState(null, '', '/inside');
+});
+
+function mount(buildId: string | null = null) {
+  render(<><BuildRouteSync buildId={buildId} /><BuildFilters /><BuildIndex /></>);
+  return within(screen.getByRole('list', { name: 'Patternflow around the world' }));
+}
+
+describe('Inside browsing', () => {
+  it('shows every entry as a text link and filters to projects', () => {
+    const list = mount();
+    expect(list.getAllByRole('link')).toHaveLength(builds.length);
+    expect(list.queryByRole('img')).not.toBeInTheDocument();
+    fireEvent.click(screen.getByRole('button', { name: 'Projects' }));
+    expect(list.getAllByRole('link')).toHaveLength(2);
+    expect(list.getByRole('link', { name: /MOTIFLOW/ })).toHaveAttribute('href', '/inside/azmano-iran');
+    expect(list.getByRole('link', { name: /Raspberry Pi port/ })).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: 'Projects' })).toHaveAttribute('aria-pressed', 'true');
+  });
+
+  it('preserves a matching selection and clears a hidden pin and its URL', () => {
+    const list = mount();
+    fireEvent.click(list.getByRole('link', { name: /MOTIFLOW/ }));
+    fireEvent.click(screen.getByRole('button', { name: 'Projects' }));
+    expect(useAppStore.getState().selectedBuildId).toBe('iran-azmano');
+    expect(window.location.pathname).toBe('/inside/azmano-iran');
+    fireEvent.click(screen.getByRole('button', { name: 'In use' }));
+    expect(useAppStore.getState().selectedBuildId).toBeNull();
+    expect(window.location.pathname).toBe('/inside');
+    expect(list.queryAllByRole('link')).toHaveLength(0);
+    expect(screen.getByText('No entries in this category yet.')).toBeInTheDocument();
+    fireEvent.click(screen.getByRole('button', { name: 'Builds' }));
+    expect(list.getByRole('link', { name: /In the DJ booth/ })).toBeInTheDocument();
+  });
+
+  it('reveals a directly linked entry even after browsing another category', () => {
+    useAppStore.setState({ insideFilter: 'builds' });
+    const list = mount('iran-azmano');
+    expect(screen.getByRole('button', { name: 'All' })).toHaveAttribute('aria-pressed', 'true');
+    expect(list.getByRole('link', { name: /MOTIFLOW/ })).toHaveAttribute('aria-current', 'true');
+  });
+
+  it('reveals a pin restored by browser history without pushing another URL', () => {
+    const list = mount();
+    fireEvent.click(screen.getByRole('button', { name: 'In use' }));
+    act(() => {
+      window.history.replaceState(null, '', '/inside/day-france');
+      window.dispatchEvent(new PopStateEvent('popstate'));
+    });
+    expect(window.location.pathname).toBe('/inside/day-france');
+    expect(list.getByRole('link', { name: /Raspberry Pi port/ })).toHaveAttribute('aria-current', 'true');
+    expect(screen.getByRole('button', { name: 'All' })).toHaveAttribute('aria-pressed', 'true');
+  });
+});